摘   要：为验证顶进施工法用钢筒混凝土顶管（JCCP）的承载能力，对JCCP进行了三点法外压荷载试验，并采用ABAQUS有限元软件对试验过程进行了模拟，研究了裂缝产生、扩展过程，并对其影响因素进行了分析。结果表明：底部支撑梁的圆弧转角及其与管体的接触特性对JCCP裂缝的发展和承载能力有显著的影响，有限元模拟时应考虑这些因素。 Abstract: In order to verify the bearing capacity of jacking cylinder concrete pipe(JCCP) using the jacking construction method, the three-edge bearing test was conducted on JCCP, and the test process was simulated using ABAQUS finite element software. The crack generation and propagation process were obtained, and the influencing factors were analyzed. The results show that the arc angle of the bottom support beam and its contact characteristics with the pipe body have a significant impact on the development of cracks and the bearing capacity of JCCP, and these factors need to be considered in the finite element simulation process.

王法武,赵利. JCCP三点法外压荷载试验与模拟研究[J].混凝土与水泥制品,2024(9):48-51,57. WANG F W,ZHAO L.Simulation and analysis of JCCP under three-edge bearing test[J].China Concrete and Cement Products,2024(9):48-51,57.

摘  要：为提高预制混凝土桩的桩间连接质量，研发了一种销钉式机械连接接头。通过销钉式机械连接、销钉式机械连接与焊接连接组合的预制桩桩间接头的抗弯性能试验，对比分析了两种连接方式的受弯承载力、破坏特性与裂缝分布情况。结果表明：两种连接方式的管桩接头试件的开裂弯矩与极限弯矩试验值均大于理论值，满足设计要求；销钉式连接的管桩接头试件破坏形式为销钉受拉脱落，销钉式连接和焊接组合的管桩接头试件破坏形式为接头受压面混凝土破坏；两种连接方式的管桩接头试件在桩身裂缝出现前，各混凝土测点应变呈线性增长，试件跨中截面应变分布基本满足平截面假定。 Abstract: In order to improve the connection performance between prefabricated concrete piles, pin mechanical joints are used. Flexural performance tests were conducted on piles connected with pin mechanical joints, pin mechanical joints and hand welded combination respectively. The flexural capacity, failure characteristics and crack distribution were compared and analyzed. The results show that the measured values of cracking moment and ultimate bending moment are higher than the theoretical values, meeting the joints design requirements. The failure of the specimen with pin mechanical joints is that part of the joints are pulled out, while the failure of the specimen with pin mechanical connection and welding combination is the concrete failure of the joint compression surface. Before the cracks appear, the strain at the concrete measuring points of the specimens increases linearly, and the plane-section assumption agrees well with the results of strain distribution in the mid-span section of the specimens.

曹伟伟,严天龙,张芳芳.销钉式抗拔管桩接头抗弯性能试验研究[J].混凝土与水泥制品,2024(9):52-57. CAO W W,YAN T L,ZHANG F F.Experimental study on flexural behavior of pin type resistant extraction pile mechanical joint[J].China Concrete and Cement Products,2024(9):52-57.